Grinding disk

Abstract

A grinding disk ( 13 ) for manually held, motor-driven grinders ( 1 ) has a centrally arranged fastening recess ( 15 ) open at the grinding disk upper side with an internal thread arrangement ( 16 ), with which the grinding disk ( 13 ) can be screwed onto a connecting part ( 8 ), which is arranged on the side of the grinder and is driven for the grinding motion during operation, and which connecting part has a thread section ( 11 ) with an external thread arrangement ( 12 ), which is associated with the internal thread arrangement ( 16 ) of the grinding disk ( 13 ). The internal thread arrangement ( 16 ) is formed by a multiple thread with at least two thread courses, which are arranged angularly offset to one another. The diameter ratio between the diameter of the internal thread arrangement ( 16 ) and the outside diameter of the grinding disk ( 13 ) is at least approximately 0.25.

1. A grinding disk for manually held, motor-driven grinders, which grinding disk has a centrally arranged fastening recess open at the grinding disk upper side with an internal thread arrangement so that the grinding disk can be screwed onto a connecting part, which is arranged on the side of the grinder and is driven for the grinding motion during operation, and which connecting part has a thread section with an external thread arrangement cooperating with the internal thread arrangement of the grinding disk, wherein the internal thread arrangement is formed by a multiple thread with at least two thread courses, which are arranged angularly offset to one another, and that the diameter ratio between the diameter of the internal thread arrangement and the outside diameter of the grinding disk is at least approximately 0.25. 
   
   
     2. The grinding disk according to  claim 1 , wherein the internal thread arrangement is formed by a threecourse thread. 
   
   
     3. The grinding disk according to  claim 1 , wherein the diameter ratio between the diameter of the internal thread arrangement and the outside diameter of the grinding disk lies in the range between approximately 0.25 to 0.5. 
   
   
     4. The grinding disk according to  claim 1 , wherein the grinding disk has a bearing surface of an annular design on its upper side, which bearing surface is arranged extending around the port of the fastening recess and rests during screwing on of the grinding disk on a grinder-side opposite surface. 
   
   
     5. The grinding disk according to  claim 4 , wherein the grinding disk forms on its upper side a plug recess, which is concentric with respect to the fastening recess and has a larger diameter than the bearing surface, for the centering engagement of a grinderside ring portion. 
   
   
     6. The grinding disk according to  claim 1 , wherein it has through openings for sucking off the dust created during grinding, which end on the one side at the underside and on the other side at the upper side of the grinding disk, whereby the upperside ports are arranged radially outside of the fastening recess circularly distributed around same. 
   
   
     7. The grinding disk according to  claim 6 , wherein the upperside ports are arranged in radial direction at least essentially within the circumference, which extends centrally between the internal thread arrangement and the outer circumference of the grinding disk. 
   
   
     8. The grinding disk according to  claim 1 , wherein the diameter ratio between the diameter of the internal thread arrangement and the outside diameter of the grinding disk lies in the range between approximately 0.3 to 0.4.